The letters were sent after the two toured low-lying areas on the Housatonic River where dozens of Oxford, Derby and Shelton residents were forced to leave when water flowed over the Stevenson Dam, which is operated by FirstLight.

Many of those evacuated complained they were not given enough prior notice of potential flooding.

Wellinghoff said the commission's staff has notified FirstLight that it should improve its flood plan coordination with the emergency management agencies and that it take "specific steps to meet these objectives."